Add c2c and chat support when there is eligible account.

Bug: 28141203
Bug: 28316618
Bug: 28316343

- Replaced hardcoded fragment layout with a RecyclerView. The old layout
  was essentially building a list manually.
- Tweaked layout to look better.
- Hide escalation cards when there is no account. Show cards when
  there is at least 1 account.
- Request an intent to start specified support type when card is
  clicked.
- Monitor account changes so we can hide/show escalation cards when
  add/remove account.

Change-Id: Ie48158b85ade1363a41817cc88b1193e0aef87ae

src/com/android/settings/overlay/FeatureFactory.java

@@ -59,7 +59,7 @@ public abstract class FeatureFactory {
         return sFactory;
     }
 
-    public abstract SupportFeatureProvider getSupportFeatureProvider();
+    public abstract SupportFeatureProvider getSupportFeatureProvider(Context context);
 
     public static final class FactoryNotFoundException extends RuntimeException {
         public FactoryNotFoundException(Throwable throwable) {